Abstract

A mixed layer of γ-Fe2O3 and Pt-Fe2O3 core-shell nanoparticles between Ti and Pt electrodes exhibited both analog and digital bipolar resistive switching depending on applied voltage. The resistance sequentially reduced with repeated −1.5 V sweeps and pulses for 100 ms and increased as repeating +1.5 V. After forming at +3 V, digital bipolar switching was achieved with SET transition from high to low resistance at +1 to 2 V and reverse RESET transition at −1 V. Pulse operation at ±2 V led to identical bipolar switching, associated with facilitated interconnection of filament segments between Pt cores in nanoparticle layer.

This research was supported by Nano·Material Technology Development Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (No. 2011-0030228). This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (No. NRF-2013R1A1A1A05005442).